Computer Fraud & Abuse Act of 1986The CFAA of 1986 was written to clarify and increase the scope of prior computer fraud legislation enacted under the Comprehensive Crime Control Act of 1984. the CFAA also limited federal jurisdiction and criminalized more computer-related acts including: distribution of malicious code, denial of service attacks, and trafficking in passwords.
The CFAA has been amended in 1988, 1989, 1990, 1994, 1996, 2000, 2002, & 2008. It was also amended in 2001 by the USA PATRIOT Act and in 2008 by the Identity Theft Enforcement and Restitution Act.
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http://en.wikipedia.org/wiki/Computer_Fraud_and_Abuse_Act